Corn on "Hardball": What's Romney Hiding in His Tax Returns?

Sen. Harry Reid (D-Nev.) ratchets up the clamoring for Romney's tax returns, suggesting that the Republican candidate has not paid any taxes. David Corn, DC bureau chief at Mother Jones, speculates on what could be so awful in those tax returns that Romney is not caving despite the intense pressure. Mother Jones blogger Kevin Drum has a take on Romney's taxes too.